适用于宽带通信的光子晶体光纤设计  

Design of Photonic Crystal Fiber for Wide Band Communication

作　　者：龚峰[1] 李承芳[1] 张亮[1] 

机构地区：[1]武汉大学物理科学与技术学院,湖北武汉430072

出　　处：《武汉大学学报（理学版）》2007年第1期85-88,共4页Journal of Wuhan University:Natural Science Edition

基　　金：国家自然科学基金资助项目(10474076)

摘　　要：用平面波展开法，分析了光子晶体光纤样品的禁带特性。用提高折射率差以及改变孔大小的方法调节样品的禁带位置及宽度，获得了包括S波段（1480～1520nm）、C波段（1525～1565nm）及L波段（1570～1620nm）宽带的带隙型光子晶体光纤．计算结果表明：在空气柱／SiO2周期结构的SiO2中掺入金属氧化物，光子带隙产生在波长1455～1515nm范围；在上述结构的空气柱中注入TiO2，其光子带隙产生在波长1481～1632nm范围，后者因具有更宽范围的光子带隙而适用于宽带光通信．文中还给出了孔半径大小与光子晶体光纤禁带的位置和宽度的直观关系，这不仅为通信波段光子晶体光纤的具体设计提供了方便，而且对其他波段的光子晶体光纤的工程设计也有参考价值．The band gap property of photonic crystal fiber sample was analyzed by plane wave expansion method, then the position and width of the sample＇s band gap was modulated by adjusting hole＇s radius and increasing the index difference between inside and outside the hole, at last PBG photonic crystal fiber with wide-gap including S-band, C-band and L-band was obtained. The calculated result shows that when metal oxide was adulterated into SiO2, the band gap was between 1 455 nm and 1 515 nm, while the band gap was between 1 481 nm and 1 632 nm when pouring TiO2 into the air hole, the latter has wider band gap for its higher index difference. The result also shows that the air hole＇s radius effect not only the position of band gap, but also the width of band gap, and the position of needed band gap and the range of wavelength by choosing appropriate air hole＇s radius. This article also gives intuitionistic relationship of hole＇s radius and the band gap＇s position and width of photonic crystal fiber. The conclusion is not only helpful for designing photonic crystal fiber in communication band, but also applicable for designing the photonic crystal fiber in the other band.

关 键 词：带隙型光子晶体光纤 平面波展开法 归一化禁带宽度 

分 类 号：O438[机械工程—光学工程]